Allen-Bradley 1746 Series User manual

Publication 1746-IN005A-US-P
Discrete I/O Modules
(Catalog Number 1746 Series)
Installation Instructions
Input Module Catalog Numbers:
1746-IA4, -IA8, -IA16, -IB8, -IB16, -IC16, -IG16, -IH16, -IM4,
-IM8, -IM16,
-IN16, -ITB16, -ITV16, -IV8, -IV16
Output Module Catalog Numbers:
1746-OA8, -OA16, -OAP12, -OB8, -OB6EI, -OB16, -OB16E,
-OBP8,
-OBP16, -OG16, -OV8, -OV16, -OVP16, -OW4, -OW8, -
OW16, -OX8
Combination Input/Output Module Catalog Numbers:
1746-IO4, -IO8, -IO12, -IO12DC
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Important User Information
Because of the variety of uses for the products described in this publication, those
responsible for the application and use of this control equipment must satisfy
themselves that all necessary steps have been taken to assure that each
application and use meets all performance and safety requirements, including any
applicable laws, regulations, codes and standards.
The illustrations, charts, sample programs and layout examples shown in this
guide are intended solely for purposes of example. Since there are many
variables and requirements associated with any particular installation, Allen-
Bradley does not assume responsibility or liability (to include intellectual
property liability) for actual use based upon the examples shown in this
publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application,
Installation, and Maintenance of Solid-State Control (available from your local
Allen-Bradley office), describes some important differences between solid-state
equipment and electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole or in part,
without written permission of Allen-Bradley Company, Inc., is prohibited.
Throughout these installation instructions we use notes to make you aware of
safety considerations:
Attention statements help you to:
• identify a hazard
• avoid the hazard
• recognize the consequences
!ATTENTION: Identifies information about practices or
circumstances that can lead to personal injury or death, property
damage or economic loss.
IMPORTANT: Identifies information that is critical for successful application and
understanding of the product.

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Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Hazardous Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Environnements Dangereux. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
General I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Heat Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Input Modules - ac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Input Modules - dc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Output Modules - ac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Output Modules - dc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Relay Contact Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Relay Contact Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Input/Output Combination Modules . . . . . . . . . . . . . . . . . . . . . . . .26
Octal Label Kit Installation (for PLC Processors Only) . . . . . . . . . . . . .27
Applying the Octal Filter Label . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Applying the Octal Door Label . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Removable Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Fuse Protection and Blown Fuse Diagnostics . . . . . . . . . . . . . . . . . . . .29
Fuse Protection (1746-OBP16 and 1746-OVP16) . . . . . . . . . . . . .29
Fuse Protection (1746-OAP12) . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Blown Fuse Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Processor Operation in Case of Blown Fuse - Processor Continues .
32 Processor Operation in Case of Blown Fuse - Processor Faults . .32
Recovery From Blown Fuse/Processor Fault/Processor Shutdown 34
Replacement Fuse Recommendations . . . . . . . . . . . . . . . . . . . . . .34
Fuse Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Electronically Protected Modules (1746-OB6EI and -OB16E) . . . . . . .36
Electronic Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Auto Reset Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Short Circuit/Overload Current Diagnostics . . . . . . . . . . . . . . . . . .37
Recovery From Channel Shutdown . . . . . . . . . . . . . . . . . . . . . . . .37
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Labeling for SLC/PLC®Systems . . . . . . . . . . . . . . . . . . . . . . . . . .38
Input Modules - ac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Input Modules - dc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Output Modules - ac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Relay Contact Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
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Input/Output Combination Modules . . . . . . . . . . . . . . . . . . . . . . . .50

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Overview
In addition to providing the module’s electrical specifications, this document tells
you how to:
• install the module into a chassis
• wire the module’s terminal block
• install the Octal Filter Label
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or
non-hazardous locations only. The following WARNING statement applies to
use in hazardous locations.
Environnements Dangereux
Cet équipement est conçu pour être utilisé dans des environnements de Classe I,
Division 2, Groupes A, B, C, D ou non dangereux. La mise en garde suivante
s’applique à une utilisation dans des environnements dangereux.
WARNING: EXPLOSION HAZARD
• Substitution of components may impair suitability for Class I,
Division 2.
• Do not replace components or disconnect equipment unless
power has been switched off or the area is known to be non-
hazardous.
• Do not connect or disconnect components unless power has
been switched off or the area is known to be non-hazardous.
• All wiring must comply with N.E.C. article 501-4(b).
AVERTISSEMENT: DANGER D’EXPLOSION
• La substitution de composants peut rendre cet équipement
impropre à une utilisation en environnement de Classe I,
Division 2.
• Ne pas remplacer de composants ou déconnecter
l'équipement sans s'être assuré que l'alimentation est coupée.
• Ne pas connecter ou déconnecter des composants sans s'être
assuré que l'alimentation est coupée.
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Installation
!ATTENTION: Never install, remove, or wire modules with
power applied to chassis.
IMPORTANT: The first slot of the chassis is reserved for the processor or the
1747-ASB module.
Slot 1 A
BD
C
max. #14 AWG (2 mm2)
max. 2 wires per terminal
max. torque: 0.9 Nm (8
in-lbs)
1. D
i
sconnect power.
2. Align circuit board of
module with chassis card
guide. (A)
3. Slide the module into the
chassis until the bottom tabs
lock into place. (B)
4. Route the wires down and
away from the module,
securing them with the wire
tie. (C)
5. To keep the chassis free
from debris, cover all
unused slots with Card Slot
Filler, catalog number 1746-
N2.
To remove the module,
press and hold the module
release located on each self-
locking tab, and slide the
module out of the chassis
slot. (D)

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Specifications
General I/O
Table 1: Specifications for All Discrete Modules
Operating Temperature 0°C to 60°C (32°F to 140°F)(1)
(1)Exceptions are indicated with certain modules.
Storage Temperature -40°C to 85°C (-40°F to 185°F)
Operating Humidity 5% to 95% (noncondensing)
Noise Immunity NEMA standard ICS 2-230
Vibration (Operating) Displacement 0.015 in peak at 5 to 57 Hz
Acceleration 2.5Gs at 57 to 2000 Hz
Shock (Operating) 30Gs (all modules except relay contact)
10Gs (relay contact modules: -OW, -OX, and
combination I/O modules)
Isolation(2)
(2)Electro-optical isolation between I/O terminals and control logic.
1500V
Agency Certification
• UL listed
• CSA certified or C-UL approved as indicated
by product marking
• CE compliant for all applicable directives
when product or packaging is marked
Hazardous Environment
Class(3)
(3)Some modules are classified Class 1, Division 2 by CSA only or C-UL only as shown in
the specification table for the respective module.
Class I, Division 2 Hazardous Environment
UL-A196, CSA, C-UL
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Heat Dissipation
The following tables contain values for the heat dissipated by each I/O module.
Use them to calculate the total amount of heat dissipated by your SLC 500™
control system. For details on how to calculate total heat dissipation, refer to the
SLC 500 Modular Hardware Style Installation and Operation Manual,
publication 1747-6.2. Please note the following definitions:
•Watts per Point - the heat dissipation that can occur in each field wiring
point when energized at nominal voltage.
•Minimum Watts - the amount of heat dissipation that can occur when there
is no field power present.
•Total Watts - the watts per point multiplied by the number of points, plus the
minimum watts (with all points energized).
Table 2: Input Module Heat Dissipation
Catalog Numbers Watts per Point Minimum Watts Total Watts
1747-IA4 0.27 0.175 1.30
1746-IA8 0.27 0.250 2.40
1746-IA16 0.27 0.425 4.80
1746-IB8 0.20 0.250 1.90
1746-IB16 0.20 0.425 3.60
1746-IC16 0.22 0.425 3.95
1746-IG16 0.02 0.700 1.00
1746-IH16 0.32 0.217 5.17
1746-IM4 0.35 0.175 1.60
1746-IM8 0.35 0.250 3.10
1746-IM16 0.35 0.425 6.00
1746-IN16 0.35 0.425 6.00
1746-ITB16 0.20 0.425 3.60
1746-ITV16 0.20 0.425 3.60
1746-IV8 0.20 0.250 1.90
1746-IV16 0.20 0.425 3.60

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Table 3: Output Module Heat Dissipation
Table 4: Combination Input/Output Module Heat Dissipation
Catalog Numbers Watts per Point Minimum Watts Total Watts
1746-OA8 1.000 0.925 9.00
1746-OA16 0.462 1.850 9.30
1746-OAP12 1.000 1.850 10.85
1746-OB6EI 0.440 0.230 2.90
1746-OB8 0.775 0.675 6.90
1746-OB16 0.388 1.400 7.60
1746-OB16E 0.150 0.675 3.07
1746-OBP8 0.300 0.675 3.08
1746-OBP16 0.310 1.250 6.26
1746-OG16 0.033 0.900 1.50
1746-OV8 0.775 0.675 6.90
1746-OV16 0.388 1.400 7.60
1746-OVP16 0.310 1.250 6.26
1746-OW4 0.133 1.310 1.90
1746-OW8 0.138 2.590 3.70
1746-OW16 0.033 5.170 5.70
1746-OX8 0.825 2.590 8.60
Catalog Numbers Watts per Point Minimum Watts Total Watts
1746-IO4 0.27 per input point
0.133 per output point 0.75 1.60
1746-IO8 0.27 per input point
0.133 per output point 1.38 3.00
1746-IO12 0.27 per input point
0.133 per output point 2.13 4.60
1746-IO12DC 0.20 per input point
0.133 per output point 1.84 3.90
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Input Modules - ac
Table 5: Specifications for Input Modules 1746-IA4, -IA8, and -IA16
Specification Catalog Number 1746-
IA4 IA8 IA16(1)
(1)Removable Terminal Block.
Voltage Category 100/120V ac Signal Input
Number of Inputs 4816
Points per Common 4816
Operating Voltage 85 to 132V ac at 47 to 63 Hz
Backplane Current
Consumption 5V dc 0.035A 0.050A 0.085A
24V dc 0.0A
Signal Delay (max.) on = 35 ms
off = 45 ms
Off State Voltage (max.) 30V ac
Off State Current (max.) 2 mA
Nominal Input Current at 120V
ac 12 mA
Inrush Current (max.)(2)
(2)An ac input device must be compatible with SLC 500 input circuit inrush current. A
current limiting resistor can be used to limit inrush current; however, the operating
characteristics of the ac incircuit will be affected.
0.8A
Inrush Current Time Duration
(max.) 0.5 ms

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Table 6: Specifications for Input Modules 1746-IM4, -IM8, and -IM16
Specification Catalog Number 1746-
IM4 IM8 IM16(1)
(1)Removable Terminal Block.
Voltage Category 200/240V ac Signal Input
Number of Inputs 4816
Points per Common 4816
Operating Voltage 170 to 265V ac at 47 to 63 Hz
Backplane Current
Consumption 5V dc 0.035A 0.050A 0.085A
24V dc 0.0A
Signal Delay (max.) on = 35 ms
off = 45 ms
Off State Voltage (max.) 50V ac
Off State Current (max.) 2 mA
Nominal Input Current at 240V ac 12 mA
Inrush Current (max.)(2)
(2)An ac input device must be compatible with SLC 500 input circuit inrush current. A current
limiting resistor can be used to limit inrush current; however, the operating characteristics
of the ac input circuit will be affected.
1.6A
Inrush Current Time Duration
(max.) 0.5 ms
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Input Modules - dc
Table 7: Specifications for Input Modules 1746-IB8, -IB16, -ITB16, and -IC16
Specification Catalog Number 1746-
IB8 IB16(1)
(1)Removable Terminal Block.
ITB16(1) IC16(1)(2)
(2)Use ID Code 0509 when configuring your system with programming software or the HHT.
Voltage Category 24V dc Signal Input (sinking) 48V dc
Signal Input
(sinking)
Number of Inputs 816 16 16
Points per Common 816 16 16
Operating Voltage 10 to 30V dc (sinking) 30 to 60V dc at 55°C 30 to 55V dc at 60°C
(sinking)
Backplane
Current
Consumptio
n
5V dc 0.050A
24V dc 0.0A
Signal Delay (max.) on = 8
ms
off = 8 ms
on = 8
ms
off = 8 ms
on = 0.3 ms
off = 0.5
ms(3)
(3)Typical signal delay for these modules: ON = 0.1 ms, OFF = 0.25 ms at 24V dc.
on = 4 ms
off = 4 ms
Off State Voltage
(max.) 5.0V dc 10.0V dc
Off State Current
(max.) 1 mA 1 mA 1.5 mA 1.5 mA
Nominal Input
Current 8 mA at 24V dc 4.1 mA at 48V dc

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Table 8: Specifications for Input Modules 1746-IV8, -IV16, and -ITV16
Specification Catalog Number 1746-
IV8 IV16(1)
(1)Removable Terminal Block.
ITV16(1)
Voltage Category 24V dc Signal Input (sourcing)
Number of Inputs 81616
Points per Common 81616
Operating Voltage 10 to 30V dc (sourcing)
Backplane Current
Consumption 5V dc 0.050A 0.085A 0.085A
24V dc 0.0A
Signal Delay (max.) on = 8 ms
off = 8 ms on = 8 ms off = 8 ms on = 0.3 ms
off = 0.5 ms(2)
(2)Typical signal delay for these modules: ON = 0.1 ms, OFF = 0.25 ms at 24V dc.
Off State Voltage (max.) 5.0V dc
Off State Current (max.) 1 mA 1 mA 1.5 mA
Nominal Input Current at
24V dc 8 mA
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Careful wire routing within the enclosure helps cut down electrical noise between
I/O lines. Refer to the SLC 500 Modular Hardware Style Installation and
Operation Manual, publication 1747-6.2, for recommended wiring procedures
for TTL modules.
Cable Length - Limit cable length to 15 meters (50 feet) per point for inputs in
standard environments. Refer to Allen-Bradley Programmable Controller Wiring
and Grounding Guidelines, publication 1770-4.1, for complete information.
Table 9: Specifications for Input Module 1746-IG16
Specification 1746-IG16(1)
(1)Removable Terminal Block.
Voltage Category 5V dc TTL Signal Input (sourcing)
Number of Inputs 16
Points per Common 16
Operating Voltage 4.5 to 5.5V dc (sourcing)
50 mV peak to peak ripple (max.)
Backplane Current
Consumption 5V dc 0.140A
24V dc 0.0A
Signal Delay (max.) on = 0.25 ms
off = 0.50 ms
Off State Voltage (max.) 2.0V dc (2)
(2)TTL inputs are inverted (-2.0 to +0.8V dc = low voltage = True = ON). Use a NOT
instruction in your ladder program to convert to traditional True = High logic.
Off State Current (max.) 4.1 mA
Nominal Input Current at 5V dc 3.7 mA
!ATTENTION: To avoid potential damage to TTL modules,
handle them by the ends of the module, not metallic surfaces.
Electrostatic discharges can damage the module. Care should be
taken to prevent exposure of terminals or components to
electrostatic charges.

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Table 10:Specifications for Input Module 1746-IN16
Specification 1746-IN16(1)
(1)Removable Terminal Block.
Voltage Category 24V ac/dc Signal Input
Number of Inputs 16
Points per Common 16
Operating Voltage dc 10 to 30V dc (sinking)
ac 10 to 30V ac
Backplane Current
Consumption 5V dc 0.085A
24V dc 0.0A
Signal Delay (max.) dc on = 15 ms
off = 15 ms
ac on = 25 ms
off = 25 ms
Off State Voltage (max.) dc 3.0V dc
ac 3.0V ac
Off State Current (max.) dc 1 mA
ac 1 mA
Nominal Input Current dc 8 mA at 24V dc
ac 8 mA at 24V ac
Inrush Current (max.) 0.02A (ac only)
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Table 11:Specifications for Input Module 1746-IH16
Specification 1746-IH16(1)(2)(3)
(1)Removable Terminal Block.
(2)Use ID Code 0507 when configuring your system with programming software or the HHT.
(3)If the input module is connected in parallel with an inductive load, use surge suppression
across the load to protect the input module from damage caused by reverse voltage.
Refer to the
SLC 500 Modular Hardware Style Installation and Operation Manual ,
publication 1747-6.2, for more information on surge suppression.
Voltage Category 125V dc Signal Input (sinking
Number of Inputs 16
Points per common 16
Operating Voltage
Range:
• 90 to 146V dc Max. Points ON Simultaneously: • 16 at 146V dc and 30°C
• 12 at 146V dc and 50°C
• 14 at 132V dc and 55°C
• 16 at 125V dc and 60°C
Backplane
Current
Consumption
5V dc 0.085A
24V dc 0.0A
Signal Delay (max.) on = 9 ms
off = 9 ms
Off State Voltage (max.) 20.0V dc
Off State Current (max.) 0.8mA
Nominal Input Current 2.15 mA at 125V dc
2.25 mA at 132V dc

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Output Modules - ac
Table 12:Specifications for Output Modules 1746-OA8, -OA16, and -OAP12
Specification Catalog Number 1746-
OA8 OA16(1)
(1)Removable Terminal Block.
OAP12(1)(2)(3)
(4)
(2)A fused common and blown fuse LED are provided on this module. See “Fuse Protection
and Blown Fuse Diagnostics” on page 32.
(3)Use ID Code 2803 when configuring your system with programming software or the HHT.
(4)Certified for Class 1, Division 2 hazardous location by CSA.
Voltage Category 120/240V ac Signal Input
Number of Outputs 81612
Points per Common 486
Operating Voltage 85 to 265V ac at 47 to 63 Hz
Backplane Current
Consumption
5V dc 0.185A 0.370A 0.370A
24V dc 0.0A
Max. Signal Delay, Resistive
Load(5)
(5)Triac outputs turn on at any point in the ac line cycle, and turn off at ac line zero cross.
on = 1 ms, off = 11.0 ms
Off State Leakage (max.)(6)
(6)To limit the effects of leakage current through solid state outputs, a loading resistor can
be connected in parallel with your load. For 120V ac operation, use a 15K Ω, 2W resistor.
For 240V ac operation, use a
15K Ω, 5W resistor.
2 mA
Load Current (min.) 10 mA
Continuous Current per
Point(7) 1.0A at 30°C
0.50A at 60°C 0.50A at 30°C 0.25A at 60°C
2.0A at 30°C
1.25A at 55°C
1.0A at 60°C
Continuous Current
per Module (max.) 8.0A at 30°C
4.0A at 60°C 8.0A at 30°C 4.0A at 60°C 9.0A at 30°C 6.0A at 60°C
On State Voltage Drop (max.) 1.50V at 1.0A 1.50V at
0.50A 1.2V at 2.0A
Surge Current per Point(8)
(max.) 10.0A for 25 ms 10.0A for 25 ms 17.0A for 25
ms(9)
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(7)Recommended surge suppression: For triac outputs when switching 120V ac inductive
loads, use Harris Metal-Oxide Varistor, model number V220MA2A. Refer to the
SLC 500
Modular Hardware Style Installation and Operation Manual
, publication 1747-6.2, for
more information on surge suppression.
(8)Repeatability is once every 1s at 30°C. Repeatability is once every 2s at 60°C.
(9)Surge current = 35A per common for 10 ms.

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Output Modules - dc
Table 13:Specifications for Output Modules 1746-OB8, -OB16, and -OB16E
Specification Catalog Number 1746-
OB8 OB16(1)
(1)Removable Terminal Block.
OB16E(1)(2)
(2)Use the following ID Code when configuring your system with programming software or
the HHT: 1746-OB16E = 2920.
Number of Outputs 81616
Points per Common 81616
Voltage Category 24V dc Signal Output
Operating Voltage (V dc) 10 to 50 (source) 10 to 30
(source)
Backplane Current
Consumption 5V dc 0.135A 0.280A 0.135A
24V dc 0.0A
Signal Delay (max.).
Resistive Load. on = 0.1 ms
off = 1.0 ms on = 0.1 ms off = 1.0 ms on = 1.0 ms(3)
off = 1.0 ms
(3)Fast turn-off modules (1746-OB6EI, -OBP8 Series B and later, -OB16E Series B and
later, -OBP16, and
-OVP16) provide fast OFF delay for inductive loads. Comparative OFF delay times for
1746-OB8/-OV8 and fast turn-off modules, when switching Bulletin 100-B110 (24W
sealed) contactor, are: 1746-OB8/-OV8 OFF delay = 152 ms; fast turn-off modules OFF
delay = 47 ms.
Off State Leakage (max.)(4)
(4)To limit the effects of leakage current through solid state outputs, a loading resistor can
be connected in parallel with your load. For transistor outputs, 24V dc operation, use a
5K Ω, 1/2W resistor.
1 mA
Load Current (min.) 1 mA
Continuous Current per
Point(5) 1.0A at 30°C
0.50A at 60°C 0.50A at 30°C 0.25A at 60°C 1.0A at 30°C(6)
0.50A at 60°C
Continuous Current per
Module 8.0A at 30°C
4.0A at 60°C 8.0A at 30°C 4.0A at 60°C 8.0A at 0 to 60°C
On State Voltage Drop (max.) 1.2V at 1.0A 1.2V at 0.50A 1.0V at 0.50A
Surge Current per Point(7) 3.0A for 10 ms 3.0A for 10 ms 2.0A for 10
ms(8)
Allen-Bradley Spares

20 Discrete I/O Modules
Publication 1746-IN005A-US-P
(5)Recommended surge suppression: For transistor outputs when switching 24V dc
inductive loads, use a 1N4004 diode reverse-wired across the load. Refer to the
SLC 500
Modular Hardware Style Installation and Operation Manual
, publication 1747-6.2, for
more information on surge suppression.
(6)Fast off delay for inductive loads is accomplished with surge suppressors on the 1746-
OB6EI, -OBP8 Series B and later, -OB16E Series B and later, -OBP16, and -OVP16
modules. A suppressor at the load is not needed unless another contact is connected in
series. If this is the case, a 1N4004 diode should be reverse wired across the load. This
defeats the fast turn-off feature.
(7)Repeatability is once every 1s at 30°C. Repeatability is once every 2s at 60°C.
(8)Surge current = 32A per module for 10 ms.
!ATTENTION: A transient pulse occurs in transistor outputs
when the external dc supply voltage is applied to the output
common terminals (e.g., via the master control relay). This can
occur regardless of the processor having power or not. For most
applications, the energy of this pulse is not sufficient to energize
the load. Refer to the SLC 500 Modular Hardware Style
Installation and Operation Manual, publication 1747-6.2, for
more information on transient pulses and guidelines to reduce
inadvertent processor operation.